. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN FERTILIZATION DYNAMICS 89 \.T7c and envelopes were found after 15 min and 3 h, respectively. These percentages were subtracted from the fertilization levels recorded in the Held for that trial. Current velocities varied widely during trials 2 through 7 and ranged mainly from to m • s~' (Fig. 3). Mean velocities varied 5-fold among trials during the initial 15- min period (from to m • s~') but were quite similar over 3 h (from to m • s~"). Sperm availability in nature In
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN FERTILIZATION DYNAMICS 89 \.T7c and envelopes were found after 15 min and 3 h, respectively. These percentages were subtracted from the fertilization levels recorded in the Held for that trial. Current velocities varied widely during trials 2 through 7 and ranged mainly from to m • s~' (Fig. 3). Mean velocities varied 5-fold among trials during the initial 15- min period (from to m • s~') but were quite similar over 3 h (from to m • s~"). Sperm availability in nature In both years of the survey (1999, 2000) and at both sites (ChC, C1C), no fertilizations were recorded during most of the sample intervals. However, in both years several sperm- release events of variable magnitude were detected. In 1999 at ChC (only station 3 surface was sampled), fertilizations occurred on March 5 (mean time-integrated fertilization level ). March 23 (). March 31 (). and April 1 (). In 2000 at ChC, fertilizations occurred on Feb- ruary 19 (station 1 only. ), March 10 (station 1. ; station 2, surface; no bottom samples were deployed and no fertilization was detected at station 3), March 19 (station 1, ; station 2. surface and bottom; station 3. surface and bottom), and March 29 (station 1, ; station 2, surface; station 3, surface; no bottom samples were deployed). At C1C (sampled only in 2000), fertilizations were detected on March 10 (station 1, ; no fertilization was detected at station 2; stations 3 and 4 were not sampled), March 17 (station 1, : station 2. ; station 3. ; station 4, ), and April 3 (station 1, ; station 2, ; stations 3 and 4 were not sampled). In laboratory controls, fertilization levels were always very high at the start of each sample interval (mean ± SE %: 1999, ± , // --•• 19; 2000, ± , n = 20). Contr
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
